Could computers and robots become conscious? If so, what happens then?

Whether or not computers or robots can gain consciousness isn't as easy a question as you might think. There is still much we don't know about human consciousness. While programmers and computer scientists create algorithms that can simulate thinking on a superficial level, cracking the code necessary to give consciousness to a machine remains beyond our grasp.

Part of the problem lies with defining consciousness. Eric Schwitzgebel, professor of philosophy at the University of California, Riverside, suggests that the concept is best explained through examples of what consciousness is and what it isn't. Schwitzgebel says that vivid sensations are part of consciousness. You could argue that through sensors, robots and computers can experience -- or at least detect -- stimuli that we would interpret as sensations. But Schwitzgebel also points out other instances of consciousness: inner speech, visual imagery, emotions and dreams are all elements we can experience that machines can't.

Not all philosophers agree upon what is and isn't consciousness. At best, most agree that consciousness rests in the brain. But we don't fully understand the mechanisms that provide consciousness.

Without this understanding, it may be impossible to endow machines with consciousness. It's possible to create programs that mimic thought. These programs might give a machine the ability to recognize and respond to patterns. But ultimately, the machine isn't aware of itself. It's simply responding to commands.

Neurologists and computer scientists could conceivably create an artificial model of a human brain that might produce consciousness. The problem these scientists face isn't trivial. Since we don't have a full understanding of how the brain works, building an artificial version might not be adequate to create actual consciousness.

Despite the challenges, there are teams of engineers and scientists around the world working toward artificial consciousness. It remains to be seen if we'll ever achieve this goal. But assuming we did find a way to give machines consciousness, what happens then?

Artificial consciousness could give way to serious ethical questions. If machines become self-aware, could they react in a negative way to the situation they're in? Could machines object to being used as tools? Would they have feelings?

There's a lot of debate on the subject. Since no one has managed to create an artificially conscious machine, it's impossible to say what features it will and won't have. But if machines gain the ability to be self-reflective, it could require us to reconsider the way we think about them. At what point would a machine possess the sort of intelligence and consciousness that would necessitate us bestowing them legal rights? Or would machines remain tools and possibly consider themselves to be slaves?

Conscious machines form the basis of several apocalyptic science fiction tales. Movies like "The Matrix" or "The Terminator" envision a world in which machines have subjugated mankind. These scenarios rely on the concept of self-recursive improvement.

Self-recursive improvement refers to the theoretical ability of a machine to examine itself, recognize ways in which it could improve its own design and then either tweak itself or build new and improved versions of machines. Each generation of machines would be smarter and better designed than the generation before. Futurist Ray Kurzweil suggests that machines will become so adept at improving themselves that before long we would enter an age in which technology evolves at a blisteringly fast pace. We would have to redefine reality because it wouldn't resemble the present at all. He calls this the singularity.

In this world, what happens to humans? In some scenarios, we merge with machines. Artificial and real consciousness become something entirely new. But in other scenarios, the machines come to the conclusion that humans are no longer necessary. At best, the machines ignore us as they continue to build more impressive technology. In the worst case, machines wipe us out either as an act of self-preservation or in revenge.

These scenarios could all be moot -- we may never learn the secret to creating an artificial consciousness. It could be that consciousness is fundamentally physiological and that we can't simulate it artificially. But just in case we do figure it all out, you may want to be a little nicer to your computer.

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